Stayed on the rubber matt and adjacent carpeted area. Avoided the tile. Felt it in my grip at one point towards end and then also a bit in the forearms (different from grip in a way). Legs and core did not get too exhausted. Breath was fine (I do a lot of muscular endurance, really in my curcitued way.)

Felt it a bit in the at risk shoulder (not really muscularly, but more lik I on purpose try to shrug a little vice hanging naturally, so I don't take the pull on the joint. I can handle 50s fine though.

Yes, I meant both. Do you recommend doing one at a time? Like what, 30/30/30/30? Of course there are a lot of possibilities and I can just try things. But this is just one exercise within an overall routine and would like to select one version and roll with it for a while.

What? No, the point of my comment is that it should NOT be your objective to do as many different possible exercises each day. There should be a reason behind the exercises you choose - which should mostly be representative of the basic functional movements.